PROTON DIFFUSION IN STRONTIUM CERATE CERAMICS STUDIED BY QUASI-ELASTIC NEUTRON-SCATTERING AND IMPEDANCE SPECTROSCOPY

被引：28

作者：

KARMONIK, C

HEMPELMANN, R

MATZKE, T

SPRINGER, T

机构：

[1] UNIV SAARLAND, D-66123 SAARBRUCKEN, GERMANY

[2] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, D-52425 JULICH, GERMANY

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 1995年 / 50卷 / 06期

关键词：

D O I：

10.1515/zna-1995-0605

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Perovskite structured strontium cerate doped with ytterbium and water, e.g. SrCe0.95 Yb-0.05 H-0.02 O-2.985, is a well known proton conductor at elevated temperatures. We have studied its proton conductivity or diffusivity, respectively, by impedance spectroscopy, IS, and by quasielastic neutron scattering, QENS. While the former method yields a macroscopic proton diffusion coefficient, the latter method allows to elucidate the microscopic proton diffusion mechanism. It consists of a sequence of free diffusion and trapping/escape events with the Yb3+ ions acting as trapping centers. The self-diffusion coefficient obtained with QENS agrees with the conductivity diffusion coefficient obtained with IS.

引用

页码：539 / 548

页数：10

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